Thanks for the comments. It is for indoors. I have a really good lumber yard here in Houston so I’m to be real picky on the wood I get. Glue and pocket screws. The reason for the 3 stiffeners on the back of the door is because of the way the grain is running. I have 3 kids I the house so I wanted to stiffen it up a bit. I wouldn’t normally run the grain that way on a door BUT I made this out of left over wood from another project.